不同法向压力加载方式下水泥土-混凝土界面剪切力学性状试验研究

兰州理工大学学报 ›› 2025, Vol. 51 ›› Issue (3): 127-133.

不同法向压力加载方式下水泥土-混凝土界面剪切力学性状试验研究

刘宏远¹, 竺明星^*1, 李小娟¹, 彭顺开², 尹倩²

1.江苏科技大学土木工程与建筑学院, 江苏镇江 212110;
2.东南大学土木工程学院, 南京 211189

收稿日期:2022-05-19 出版日期:2025-06-28 发布日期:2025-06-30
通讯作者: 竺明星(1985-),男,江苏南京人,博士,副教授.Email:mxingzhu@just.edu.cn
基金资助:
国家自然基金青年基金(52201324)

Experimental study on shear mechanical properties of cement-soil-concrete interface under different normal pressure loading modes

LIU Hong-yuan¹, ZHU Ming-xing¹, LI Xiao-juan¹, PENG Shun-kai², YIN Qian²

1. School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212110, China;
2. School of Civil Engineering, Southeast University, Nanjing 211189, China

Received:2022-05-19 Online:2025-06-28 Published:2025-06-30

摘要/Abstract

摘要： 目前水泥土研究主要聚焦于其强度特性,而在水泥土-结构物界面剪切力学特性方面的研究相对比较匮乏,这将制约水泥土加固地基技术在以水平承载为主的大型块体基础中推广应用.为此,基于自主研制的大型界面剪切设备,开展了系列变法向应力反复加卸载和变法向应力连续加载等方式下的水泥土-混凝土界面剪切试验与机理研究,并基于摩尔-库伦准则推导了界面最小摩擦系数公式.结果表明:水泥土固化效应对界面剪切力学性能具有显著的增益作用,水泥土-混凝土界面摩擦系数随着固化时间的增长而逐渐提高;滑动剪切面在法向压力预压作用下可实现重塑,进而使得单个试样在反复加卸载方式下的界面剪切特性近似与多个相同试样单独加载等效;法向应力连续加载方式下的水泥土-混凝土界面剪切性能出现减弱现象,实际工程中应避免高估这种法向应力加载方式下的界面剪切性能.

关键词: 界面剪切试验, 变法向应力, 水泥土-混凝土接触面

Abstract: The current research on cement-soil mainly focuses on its strength characteristics, while studies on the shearing mechanical properties of the cement-soil-structure interface remain relatively limited, which will restrict the promotion and application of cement-soil reinforcement technology in large-scale block foundations under horizontal loading. Thus, based on the self-developed large-scale interface shearing equipment, a series of shear tests and mechanistic studies on the cement-soil-concrete interface under repeated loading-unloading of variable normal stress mode and continuous normal stress loading mode have been performed, respectively. Moreover, based on the Mohr-Coulomb criterion, the formula for the minimum friction coefficient of the interface was derived.The results show that the solidification effect of cement-soil can significantly enhance the interface shear mechanical properties. The friction coefficient of the cement-soil-concrete interface gradually increases with the increase of curing time. The sliding shear plane can be remolded under pre-loaded normal pressure. As a result, the interfacial shear characteristics of a single specimen under cyclic loading-unloading modes are approximately equivalent to that of multiple identical specimens separately loaded. The shear behavior of the cement-soil-concrete interface under continuous normal stress loading will become weaker. Thus, in practical engineering, the shear performance of interfaces under such loading conditions should not be overestimated.

Key words: interface shear test, variable normal stress, cement-soil-concrete interface

中图分类号:

TU411

刘宏远, 竺明星, 李小娟, 彭顺开, 尹倩. 不同法向压力加载方式下水泥土-混凝土界面剪切力学性状试验研究[J]. 兰州理工大学学报, 2025, 51(3): 127-133.

LIU Hong-yuan, ZHU Ming-xing, LI Xiao-juan, PENG Shun-kai, YIN Qian. Experimental study on shear mechanical properties of cement-soil-concrete interface under different normal pressure loading modes[J]. Journal of Lanzhou University of Technology, 2025, 51(3): 127-133.

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